Processing Systems

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Processing Systems

• 3.3.2

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This presentation covers

• Batch, interactive and real-time processing
  systems in terms of processing, response time and
  user interface requirements.

3
Introduction

• Data is pretty useless unless it is processed in
  some way.
• The way in which the data is processed can be
  different and the mode of operation is different
  depending on the situation.
• The decision as to which operational mode to use
  is made during the design stage.

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Batch Processing

• Data is processed in batches.
• The batches tend to be large and of identical
  type.
• Common examples of where batch processing occurs
  include the processing of bank statements,
  utility bills and credit card transactions.

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Batch Processing

• No user interaction is required.
• Batch processing usually takes place during the
  evening or on the weekends, when there is less
  demand on the processor.
• Both of these facts mean that daily work can
  continue with little disruption.

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Batch Processing

• The main problem with batch processing is the
  delay in receiving the output from the data
  input.
• For example, sometimes you can pay for something
  using a credit card, but the money is not taken
  out straight away. If you arent aware of this
  and you think you have that
• money in your account you might
• go spending the moneythus
• putting you into debt!

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Interactive Processing

• Also known as a transactional processing system.
• Data is processed one transaction at a time.
• Any response or update must be completed before
  the next transaction can take place.
• Data inputs tend to be small and input
  interactively by the user.

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Interactive Processing

• The user inputs data into the system when
  prompted to do so.
• Their actions are limited to what the system
  allows them to enter.

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Bus Example
People queue waiting for the bus.
When they get on, the driver asks where do they
want to go?
They pay their fare and the next person steps up!
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Real-Time Processing

• Data is processed within a given maximum time
  limit (usually under 4 seconds).
• The time limit will depend on a number of
  factors
• User requirements
• Type of processing
• Amount to process

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Real-Time Processing

• It is normally assumed that data will be
  processed as soon as it is received.
• This could result in data being updated straight
  away on a database, or an action taking place.

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Real-Time Processing

• A good example of real-time processing is in
  auto-pilot systems.
• They wouldnt be very useful in the following
  example

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Batch Autopilot
Oh look, were heading towards that plane! Ill
save that information for later
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Batch Autopilot
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What to do now

• Create and complete the following summary table

Batch Interactive Real-Time
Processing
Response time
User interface requirements